Rollup of 8 pull requests

config.toml.example

@@ -315,7 +315,7 @@
 # `0` - no debug info
 # `1` - line tables only
 # `2` - full debug info with variable and type information
-# Can be overriden for specific subsets of Rust code (rustc, std or tools).
+# Can be overridden for specific subsets of Rust code (rustc, std or tools).
 # Debuginfo for tests run with compiletest is not controlled by this option
 # and needs to be enabled separately with `debuginfo-level-tests`.
 #debuginfo-level = if debug { 2 } else { 0 }

src/bootstrap/compile.rs

@@ -141,7 +141,7 @@ fn copy_third_party_objects(
         copy_and_stamp(&srcdir, "crt1.o");
     }
 
-    // Copies libunwind.a compiled to be linked wit x86_64-fortanix-unknown-sgx.
+    // Copies libunwind.a compiled to be linked with x86_64-fortanix-unknown-sgx.
     //
     // This target needs to be linked to Fortanix's port of llvm's libunwind.
     // libunwind requires support for rwlock and printing to stderr,

src/bootstrap/flags.rs

@@ -33,7 +33,7 @@ pub struct Flags {
     pub rustc_error_format: Option<String>,
     pub dry_run: bool,
 
-    // This overrides the deny-warnings configuation option,
+    // This overrides the deny-warnings configuration option,
     // which passes -Dwarnings to the compiler invocations.
     //
     // true => deny, false => warn

src/ci/azure-pipelines/try.yml

@@ -20,7 +20,7 @@ jobs:
 
 # The macOS and Windows builds here are currently disabled due to them not being
 # overly necessary on `try` builds. We also don't actually have anything that
-# consumes the artifacts currently. Perhaps one day we can reenable, but for now
+# consumes the artifacts currently. Perhaps one day we can re-enable, but for now
 # it helps free up capacity on Azure.
 # - job: macOS
 #   timeoutInMinutes: 600

src/doc/rustdoc/src/unstable-features.md

@@ -453,7 +453,7 @@ override `ignore`.
 
 ### `--runtool`, `--runtool-arg`: program to run tests with; args to pass to it
 
-Using thses options looks like this:
+Using these options looks like this:
 
 ```bash
 $ rustdoc src/lib.rs -Z unstable-options --runtool runner --runtool-arg --do-thing --runtool-arg --do-other-thing

src/doc/unstable-book/src/language-features/marker-trait-attr.md

@@ -21,7 +21,7 @@ when they'd need to do the same thing for every type anyway).
 
 impl<T: Copy> CheapToClone for T {}
 
-// These could potentally overlap with the blanket implementation above,
+// These could potentially overlap with the blanket implementation above,
 // so are only allowed because CheapToClone is a marker trait.
 impl<T: CheapToClone, U: CheapToClone> CheapToClone for (T, U) {}
 impl<T: CheapToClone> CheapToClone for std::ops::Range<T> {}

src/liballoc/collections/btree/node.rs

@@ -306,7 +306,7 @@ impl<K, V> Root<K, V> {
 ///   `NodeRef` could be pointing to either type of node.
 ///   Note that in case of a leaf node, this might still be the shared root!
 ///   Only turn this into a `LeafNode` reference if you know it is not the shared root!
-///   Shared references must be dereferencable *for the entire size of their pointee*,
+///   Shared references must be dereferenceable *for the entire size of their pointee*,
 ///   so '&LeafNode` or `&InternalNode` pointing to the shared root is undefined behavior.
 ///   Turning this into a `NodeHeader` reference is always safe.
 pub struct NodeRef<BorrowType, K, V, Type> {

src/liballoc/collections/linked_list.rs

@@ -841,10 +841,10 @@ impl<T> LinkedList<T> {
     /// d.push_front(2);
     /// d.push_front(3);
     ///
-    /// let mut splitted = d.split_off(2);
+    /// let mut split = d.split_off(2);
     ///
-    /// assert_eq!(splitted.pop_front(), Some(1));
-    /// assert_eq!(splitted.pop_front(), None);
+    /// assert_eq!(split.pop_front(), Some(1));
+    /// assert_eq!(split.pop_front(), None);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn split_off(&mut self, at: usize) -> LinkedList<T> {

src/liballoc/collections/vec_deque.rs

@@ -2132,7 +2132,7 @@ impl<T> VecDeque<T> {
     // Safety: the following two methods require that the rotation amount
     // be less than half the length of the deque.
     //
-    // `wrap_copy` requres that `min(x, cap() - x) + copy_len <= cap()`,
+    // `wrap_copy` requires that `min(x, cap() - x) + copy_len <= cap()`,
     // but than `min` is never more than half the capacity, regardless of x,
     // so it's sound to call here because we're calling with something
     // less than half the length, which is never above half the capacity.

src/liballoc/tests/slice.rs

@@ -1733,9 +1733,9 @@ fn panic_safe() {
     let moduli = &[5, 20, 50];
 
     #[cfg(miri)]
-    let lens = 1..13;
+    let lens = 1..10;
     #[cfg(miri)]
-    let moduli = &[10];
+    let moduli = &[5];
 
     for len in lens {
         for &modulus in moduli {

src/liballoc/vec.rs

@@ -2894,7 +2894,7 @@ where
     /// The filter test predicate.
     pred: F,
     /// A flag that indicates a panic has occurred in the filter test prodicate.
-    /// This is used as a hint in the drop implmentation to prevent consumption
+    /// This is used as a hint in the drop implementation to prevent consumption
     /// of the remainder of the `DrainFilter`. Any unprocessed items will be
     /// backshifted in the `vec`, but no further items will be dropped or
     /// tested by the filter predicate.

src/libcore/alloc.rs

@@ -140,6 +140,18 @@ impl Layout {
         unsafe { Layout::from_size_align_unchecked(size, align) }
     }
 
+    /// Creates a `NonNull` that is dangling, but well-aligned for this Layout.
+    ///
+    /// Note that the pointer value may potentially represent a valid pointer,
+    /// which means this must not be used as a "not yet initialized"
+    /// sentinel value. Types that lazily allocate must track initialization by
+    /// some other means.
+    #[unstable(feature = "alloc_layout_extra", issue = "55724")]
+    pub const fn dangling(&self) -> NonNull<u8> {
+        // align is non-zero and a power of two
+        unsafe { NonNull::new_unchecked(self.align() as *mut u8) }
+    }
+
     /// Creates a layout describing the record that can hold a value
     /// of the same layout as `self`, but that also is aligned to
     /// alignment `align` (measured in bytes).

src/libcore/convert/mod.rs

@@ -229,7 +229,7 @@ pub trait AsMut<T: ?Sized> {
 ///
 /// # Implementing [`Into`] for conversions to external types in old versions of Rust
 ///
-/// Prior to Rust 1.40, if the destination type was not part of the current crate
+/// Prior to Rust 1.41, if the destination type was not part of the current crate
 /// then you couldn't implement [`From`] directly.
 /// For example, take this code:
 ///

src/libcore/fmt/mod.rs

@@ -255,7 +255,7 @@ pub struct ArgumentV1<'a> {
     formatter: fn(&Opaque, &mut Formatter<'_>) -> Result,
 }
 
-// This gurantees a single stable value for the function pointer associated with
+// This guarantees a single stable value for the function pointer associated with
 // indices/counts in the formatting infrastructure.
 //
 // Note that a function defined as such would not be correct as functions are

src/libcore/mem/manually_drop.rs

@@ -93,7 +93,7 @@ impl<T> ManuallyDrop<T> {
     /// Instead of using [`ManuallyDrop::drop`] to manually drop the value,
     /// you can use this method to take the value and use it however desired.
     ///
-    /// Whenever possible, it is preferrable to use [`into_inner`][`ManuallyDrop::into_inner`]
+    /// Whenever possible, it is preferable to use [`into_inner`][`ManuallyDrop::into_inner`]
     /// instead, which prevents duplicating the content of the `ManuallyDrop<T>`.
     ///
     /// # Safety

src/libcore/mem/mod.rs

@@ -91,7 +91,7 @@ pub use crate::intrinsics::transmute;
 /// Using `ManuallyDrop` here has two advantages:
 ///
 /// * We do not "touch" `v` after disassembling it. For some types, operations
-///   such as passing ownership (to a funcion like `mem::forget`) requires them to actually
+///   such as passing ownership (to a function like `mem::forget`) requires them to actually
 ///   be fully owned right now; that is a promise we do not want to make here as we are
 ///   in the process of transferring ownership to the new `String` we are building.
 /// * In case of an unexpected panic, `ManuallyDrop` is not dropped, but if the panic

src/libcore/pin.rs

@@ -312,7 +312,7 @@
 //!
 //! ## Examples
 //!
-//! For a type like [`Vec<T>`], both possibilites (structural pinning or not) make sense.
+//! For a type like [`Vec<T>`], both possibilities (structural pinning or not) make sense.
 //! A [`Vec<T>`] with structural pinning could have `get_pin`/`get_pin_mut` methods to get
 //! pinned references to elements. However, it could *not* allow calling
 //! [`pop`][Vec::pop] on a pinned [`Vec<T>`] because that would move the (structurally pinned)
@@ -539,7 +539,7 @@ impl<P: Deref> Pin<P> {
     /// ```
     /// A value, once pinned, must remain pinned forever (unless its type implements `Unpin`).
     ///
-    /// Similarily, calling `Pin::new_unchecked` on an `Rc<T>` is unsafe because there could be
+    /// Similarly, calling `Pin::new_unchecked` on an `Rc<T>` is unsafe because there could be
     /// aliases to the same data that are not subject to the pinning restrictions:
     /// ```
     /// use std::rc::Rc;

src/libcore/ptr/const_ptr.rs

@@ -53,7 +53,7 @@ impl<T: ?Sized> *const T {
     /// all of the following is true:
     /// - it is properly aligned
     /// - it must point to an initialized instance of T; in particular, the pointer must be
-    ///   "dereferencable" in the sense defined [here].
+    ///   "dereferenceable" in the sense defined [here].
     ///
     /// This applies even if the result of this method is unused!
     /// (The part about being initialized is not yet fully decided, but until
@@ -183,7 +183,7 @@ impl<T: ?Sized> *const T {
     /// within the same allocated object: [`offset`] is immediate Undefined Behavior when
     /// crossing object boundaries; `wrapping_offset` produces a pointer but still leads
     /// to Undefined Behavior if that pointer is dereferenced. [`offset`] can be optimized
-    /// better and is thus preferrable in performance-sensitive code.
+    /// better and is thus preferable in performance-sensitive code.
     ///
     /// If you need to cross object boundaries, cast the pointer to an integer and
     /// do the arithmetic there.
@@ -480,7 +480,7 @@ impl<T: ?Sized> *const T {
     /// within the same allocated object: [`add`] is immediate Undefined Behavior when
     /// crossing object boundaries; `wrapping_add` produces a pointer but still leads
     /// to Undefined Behavior if that pointer is dereferenced. [`add`] can be optimized
-    /// better and is thus preferrable in performance-sensitive code.
+    /// better and is thus preferable in performance-sensitive code.
     ///
     /// If you need to cross object boundaries, cast the pointer to an integer and
     /// do the arithmetic there.
@@ -535,7 +535,7 @@ impl<T: ?Sized> *const T {
     /// within the same allocated object: [`sub`] is immediate Undefined Behavior when
     /// crossing object boundaries; `wrapping_sub` produces a pointer but still leads
     /// to Undefined Behavior if that pointer is dereferenced. [`sub`] can be optimized
-    /// better and is thus preferrable in performance-sensitive code.
+    /// better and is thus preferable in performance-sensitive code.
     ///
     /// If you need to cross object boundaries, cast the pointer to an integer and
     /// do the arithmetic there.

src/libcore/ptr/mod.rs

@@ -19,7 +19,7 @@
 //! * All pointers (except for the null pointer) are valid for all operations of
 //!   [size zero][zst].
 //! * For a pointer to be valid, it is necessary, but not always sufficient, that the pointer
-//!   be *dereferencable*: the memory range of the given size starting at the pointer must all be
+//!   be *dereferenceable*: the memory range of the given size starting at the pointer must all be
 //!   within the bounds of a single allocated object. Note that in Rust,
 //!   every (stack-allocated) variable is considered a separate allocated object.
 //! * All accesses performed by functions in this module are *non-atomic* in the sense

src/libcore/ptr/mut_ptr.rs

@@ -49,7 +49,7 @@ impl<T: ?Sized> *mut T {
     /// memory.
     ///
     /// When calling this method, you have to ensure that if the pointer is
-    /// non-NULL, then it is properly aligned, dereferencable (for the whole
+    /// non-NULL, then it is properly aligned, dereferenceable (for the whole
     /// size of `T`) and points to an initialized instance of `T`. This applies
     /// even if the result of this method is unused!
     /// (The part about being initialized is not yet fully decided, but until
@@ -176,7 +176,7 @@ impl<T: ?Sized> *mut T {
     /// within the same allocated object: [`offset`] is immediate Undefined Behavior when
     /// crossing object boundaries; `wrapping_offset` produces a pointer but still leads
     /// to Undefined Behavior if that pointer is dereferenced. [`offset`] can be optimized
-    /// better and is thus preferrable in performance-sensitive code.
+    /// better and is thus preferable in performance-sensitive code.
     ///
     /// If you need to cross object boundaries, cast the pointer to an integer and
     /// do the arithmetic there.
@@ -224,7 +224,7 @@ impl<T: ?Sized> *mut T {
     /// all of the following is true:
     /// - it is properly aligned
     /// - it must point to an initialized instance of T; in particular, the pointer must be
-    ///   "dereferencable" in the sense defined [here].
+    ///   "dereferenceable" in the sense defined [here].
     ///
     /// This applies even if the result of this method is unused!
     /// (The part about being initialized is not yet fully decided, but until
@@ -526,7 +526,7 @@ impl<T: ?Sized> *mut T {
     /// within the same allocated object: [`add`] is immediate Undefined Behavior when
     /// crossing object boundaries; `wrapping_add` produces a pointer but still leads
     /// to Undefined Behavior if that pointer is dereferenced. [`add`] can be optimized
-    /// better and is thus preferrable in performance-sensitive code.
+    /// better and is thus preferable in performance-sensitive code.
     ///
     /// If you need to cross object boundaries, cast the pointer to an integer and
     /// do the arithmetic there.
@@ -581,7 +581,7 @@ impl<T: ?Sized> *mut T {
     /// within the same allocated object: [`sub`] is immediate Undefined Behavior when
     /// crossing object boundaries; `wrapping_sub` produces a pointer but still leads
     /// to Undefined Behavior if that pointer is dereferenced. [`sub`] can be optimized
-    /// better and is thus preferrable in performance-sensitive code.
+    /// better and is thus preferable in performance-sensitive code.
     ///
     /// If you need to cross object boundaries, cast the pointer to an integer and
     /// do the arithmetic there.

src/libcore/tests/alloc.rs

@@ -1,10 +1,13 @@
 use core::alloc::Layout;
+use core::ptr::NonNull;
 
 #[test]
 fn const_unchecked_layout() {
     const SIZE: usize = 0x2000;
     const ALIGN: usize = 0x1000;
     const LAYOUT: Layout = unsafe { Layout::from_size_align_unchecked(SIZE, ALIGN) };
+    const DANGLING: NonNull<u8> = LAYOUT.dangling();
     assert_eq!(LAYOUT.size(), SIZE);
     assert_eq!(LAYOUT.align(), ALIGN);
+    assert_eq!(Some(DANGLING), NonNull::new(ALIGN as *mut u8));
 }

src/libcore/tests/lib.rs

@@ -1,3 +1,4 @@
+#![feature(alloc_layout_extra)]
 #![feature(bool_to_option)]
 #![feature(bound_cloned)]
 #![feature(box_syntax)]

src/libfmt_macros/lib.rs

@@ -176,7 +176,7 @@ pub struct Parser<'a> {
     skips: Vec<usize>,
     /// Span of the last opening brace seen, used for error reporting
     last_opening_brace: Option<InnerSpan>,
-    /// Wether the source string is comes from `println!` as opposed to `format!` or `print!`
+    /// Whether the source string is comes from `println!` as opposed to `format!` or `print!`
     append_newline: bool,
 }
 

src/libproc_macro/bridge/client.rs

@@ -15,7 +15,7 @@ macro_rules! define_handles {
         }
 
         impl HandleCounters {
-            // FIXME(eddyb) use a reference to the `static COUNTERS`, intead of
+            // FIXME(eddyb) use a reference to the `static COUNTERS`, instead of
             // a wrapper `fn` pointer, once `const fn` can reference `static`s.
             extern "C" fn get() -> &'static Self {
                 static COUNTERS: HandleCounters = HandleCounters {
@@ -334,7 +334,7 @@ impl Bridge<'_> {
 #[repr(C)]
 #[derive(Copy, Clone)]
 pub struct Client<F> {
-    // FIXME(eddyb) use a reference to the `static COUNTERS`, intead of
+    // FIXME(eddyb) use a reference to the `static COUNTERS`, instead of
     // a wrapper `fn` pointer, once `const fn` can reference `static`s.
     pub(super) get_handle_counters: extern "C" fn() -> &'static HandleCounters,
     pub(super) run: extern "C" fn(Bridge<'_>, F) -> Buffer<u8>,

src/librustc/hir/map/mod.rs

@@ -653,7 +653,7 @@ impl<'hir> Map<'hir> {
         }
     }
 
-    /// Wether `hir_id` corresponds to a `mod` or a crate.
+    /// Whether `hir_id` corresponds to a `mod` or a crate.
     pub fn is_hir_id_module(&self, hir_id: HirId) -> bool {
         match self.lookup(hir_id) {
             Some(Entry { node: Node::Item(Item { kind: ItemKind::Mod(_), .. }), .. })

src/librustc/middle/codegen_fn_attrs.rs

@@ -58,9 +58,6 @@ bitflags! {
         /// "weird symbol" for the standard library in that it has slightly
         /// different linkage, visibility, and reachability rules.
         const RUSTC_STD_INTERNAL_SYMBOL = 1 << 6;
-        /// `#[no_debug]`: an indicator that no debugging information should be
-        /// generated for this function by LLVM.
-        const NO_DEBUG                  = 1 << 7;
         /// `#[thread_local]`: indicates a static is actually a thread local
         /// piece of memory
         const THREAD_LOCAL              = 1 << 8;

src/librustc/mir/interpret/allocation.rs

@@ -610,7 +610,7 @@ impl<Tag, Extra> Allocation<Tag, Extra> {
         // a naive undef mask copying algorithm would repeatedly have to read the undef mask from
         // the source and write it to the destination. Even if we optimized the memory accesses,
         // we'd be doing all of this `repeat` times.
-        // Therefor we precompute a compressed version of the undef mask of the source value and
+        // Therefore we precompute a compressed version of the undef mask of the source value and
         // then write it back `repeat` times without computing any more information from the source.
 
         // A precomputed cache for ranges of defined/undefined bits

src/librustc/mir/visit.rs

@@ -888,7 +888,7 @@ macro_rules! visit_place_fns {
     () => (
         fn visit_projection(
             &mut self,
-            local: &Local,
+            local: Local,
             projection: &[PlaceElem<'tcx>],
             context: PlaceContext,
             location: Location,
@@ -898,7 +898,7 @@ macro_rules! visit_place_fns {
 
         fn visit_projection_elem(
             &mut self,
-            local: &Local,
+            local: Local,
             proj_base: &[PlaceElem<'tcx>],
             elem: &PlaceElem<'tcx>,
             context: PlaceContext,
@@ -925,15 +925,15 @@ macro_rules! visit_place_fns {
 
             self.visit_place_base(&place.local, context, location);
 
-            self.visit_projection(&place.local,
+            self.visit_projection(place.local,
                                   &place.projection,
                                   context,
                                   location);
         }
 
         fn super_projection(
             &mut self,
-            local: &Local,
+            local: Local,
             projection: &[PlaceElem<'tcx>],
             context: PlaceContext,
             location: Location,
@@ -947,7 +947,7 @@ macro_rules! visit_place_fns {
 
         fn super_projection_elem(
             &mut self,
-            _local: &Local,
+            _local: Local,
             _proj_base: &[PlaceElem<'tcx>],
             elem: &PlaceElem<'tcx>,
             _context: PlaceContext,

src/librustc/ty/layout.rs

@@ -2579,7 +2579,7 @@ where
                 if let Some(kind) = pointee.safe {
                     attrs.pointee_align = Some(pointee.align);
 
-                    // `Box` (`UniqueBorrowed`) are not necessarily dereferencable
+                    // `Box` (`UniqueBorrowed`) are not necessarily dereferenceable
                     // for the entire duration of the function as they can be deallocated
                     // any time. Set their valid size to 0.
                     attrs.pointee_size = match kind {